Slip jacket



Sept. 29, 1936./ J. B. MEYER sLIP JACKET Filed Jan. 9, 1936 UNITEDVSTATES PATENT GFFICE SLIP JACKET John B. Meyer, Dubuque, Iowa, assignorto The Adams Company, Dubuque, Iowa, a corporation of Iowa ApplicationJanuary 9, 1936, Serial No. 58,285

4 Claims.

This invention relates to slip jackets, sometimes also known asstrippers, used for the purpose of protecting sand molds during thepouring of the castings, and has special reference to a metal jacket ofimproved structural characteristics.

Slip jackets of the type herein contemplated are intended for use infoundry practice, and are slipped over the sand molds just prior to thepouring operations and after the removal of the flask. It is thereforenecessary that the jackets maintain an accurate inner shape so as toclosely t the outside of the mold. It is in this respect that slipjackets most frequently fail, and after a period of use lose theiraccuracy and become Warped or twisted so that they no longer properlyfit the outside of the mold. This is occasioned by two types of factors,the first being the conditions to which the jacket is subjected duringthe pouring operation. Some strain is placed on the jacket by thepressure of the metal in the mold cavity and also the pouring processoccasions rapid changes in temperature, the jacket being heated duringthe pouring process and then being rather rapidly cooled when removedand placed on a fresh and cold mold. The second factor is the roughhandling to which the jackets are subjected. Normally .the jackets aretossed about rather carelessly and given rather severe treatment. Underthese circumstances the jackets tend to get out of shape and mostfrequently this occurs at or near the corners. I have found that thismay be largely avoided by certain improvements in the mechanicalconstruction of the jackets whereby the strength and rigidity of thestructure are balanced to a greater nicety and are enhanced at thepoints where increased strength and rigidity are normally required.

A primary object of the invention is the provision of an improved slipjacket of greater strength and rigidity and having a longer useful lifeunder the rough handling to which such devices are ordinarily subjected.

Another object of the invention is the provision of a metal slip jacketof such construction that the changes in temperature to which the sameis subjected in use and the rough handling usually accorded such devicesdoes not cause it to loose its accuracy and trueness of shape.

A further object of the invention is to provide a metal slip jackethaving an improved corner construction.

Other objects and advantages will be apparent from the followingdescription and the accompanying drawing, in which- Figure 1 is a topview of a slip jacket embodying my invention;

Fig. 2 is a section on the line 2-2 of Figure 1, and

Fig. 3 is a fragmentary perspective showing of 5 the corner constructionof the slip jacket.

The invention contemplates a metal jacket having side walls 5, 8, 'I and8 of sheet metal, the walls in this instance each consisting of arelatively heavy plate having longitudinally spaced openings 9 for thepassage of gases in the usual manner. Corner angle members II to I4 arepositioned at the corners of the body extending laterally of the bodyand seated over the outside of the corners. The side walls 6 and 8 are0f l5 such length as to extend completely into the corner of the anglemembers while the side walls 5 and i abut against the walls 6 and 8adjacent the end, as shown in Figures l and 3. The corner angle membersare secured in place by any suitable means, in this instance by spotWelding, as shown at I5 (Fig. 3). These corner angle members hold thesideA walls together in the required positions and prevent lateraldisplacement of the walls at the corners.

Angle reinforcement members indicated generally by the numerals I6 andIl are laterally spaced on the sides 5 and 'I of the body and eX- tendlongitudinally thereof. These members are preferably spot welded to theside members as shown at I8 and I9. Angle reinforcement members 2I and22 are likewise positioned on the sides 6 and 8 of the body members andare attached thereto in the same manner. The reinforcement members areof angle metal, and one side is arranged to seat in surface contact withthe side members, as best shown in Fig. 3. It will be understood thatother means than welding may be employed for securing the reinforcingmembers to the side members, though I prefer to weld the two together tomake a firm and rigid connection. Each of the reinforcement membersextends beyond the corners of the body as shown in Figs. 1 and 3. Toaccomplish this, each of the reinforcement members is bent or formedadjacent its ends as shown at 23 to provide a space 24 for the receptionof the corner angle members I5. The space 24 is such that thereinforcement members will t snugly against the outer surface of thecorner angle members so as to conne the latter between the side wallsand the reinforcement members. One side of the reinforcement members I6and I7 is cut away flush with the corner members I5 as shown at 25 and26 so that the 55 reinforcement members I6 and 2| and the reinforcementmembers I1 and 22, respectively, may overlap at each corner, as shown inFig. 3. 'Ihe reinforcement members are interconnected in thisoverlapping area by welding as shown at 21. It will be understood thatother suitable connecting means, such as rivets, may be employed forthis purpose, though I prefer to Weld the same. It will be seen thatthis forms a rigid reinforcing member extending completely around thebody in' a truss-like manner producing a very rigid corner construction.By this means the points of Weakness heretofore occurring at intervalsaround the body and usually at or adjacent to the corners of the bodyare entirely eliminated. Wood blocks 28 and`2`49 attached to thereinforcing members 2l "serve as grips for handling the slip jacket inplacing and removing the same from the mold.

I desire to place particular emphasison Ithe construction whereby thereinforcement members are extended to overlap beyond the'corners of thebody and are interconnected in this overlapping area so as to provide arigidv connection spaced diagonally outwardly from the corners, and tothe fact that-this connection is formed on the reinforcement memberswhich extend completely around the body of the jacket, the side walls'ofAthe jacket being attached thereto Whereby distortion of the side Wallsis prevented by the angle reinforcement members. The number ofreinforcement angle members will vary dependent .upon the depth of thejacket. Ordinarily it is advisable to use at least two annularreinforcement ribs formed by the reinforcement members, vbut a singlereinforcement rib may be employed satisfactorily if the jacket is veryshallow.

rWhile I have thus described and illustrated a specific embodiment of myinvention, I am aware that numerous changes may be made from that herein.illustrated and described, and I do not wish to.be limited except asrequired by the prior art and the scope of the appended claims, inwhich- I claim:

1. The combination in a metal slip jacket of sidewalls arranged to forma corner, a corner' walls and seated over the outside of said corner,and a plurality of reinforcement angle members fixed to the outside ofsaid Walls extending longitudinally thereof over said corner anglemembers and beyond said corners overlapping in pairs, and being rigidlyinterconnected in the overlapping area to form annular ribs.

2. The combination in a metal slip jacket of side walls arranged to forma corner, a corner angle member extending transversely of said walls andseated over the outside of said corner, a plurality of reinforcementangle members having one side seated against and fixed to the outside ofsaid walls extending longitudinally thereof, the reinforcement membersof adjoining Walls overlapping beyond the corner and being shaped toseat against said corner angle member toconnethe same, and means torigidly connect said reinforcement angle members in to form annularribs, the reinforcement members of each'rib being rigidly interconnectedin the overlapping area to Vprevent distortion of said walls.

4. The combination in a metal slip jacket of side Walls arranged to forma corner, a corner angle member extending transversely of said walls andseated over the outside of said corner, a plurality of anglereinforcement members having one side seated in face contact .with theoutside of said walls, fixed thereto and extending longitudinallythereof, the other side of said members projecting at an angle withrespect to said walls, the reinforcement members of adjoining wallsseating against said corner angle member and the angularly disposedportions f

